You may have read that their mutual relationship is a bit strained at the moment.
You may not have read a pair of amusing and informative posts by Chris Matyszczyk, a creative director and CNET blogger. One criticizes Google's advertising for the Nexus One. The other wonders who called who for a semi-publicized cup of coffee, Steve Jobs or Eric Schmidt.
If you have a moment, both posts are worth a read because both companies will continue to loom large for the advertising industry.